Blissfully Ignorant

You know, I know this steak doesn't exist. I know that when I put it in my mouth, the Matrix is telling my brain that it is juicy and delicious. After nine years, you know what I realize? [Takes a bite of steak] Ignorance is bliss. — Joe Pantoliano as Cypher in The Matrix

Admittedly, the loss of one’s innocence (or ignorance) could lead to some discomfort, discontent, sadness, or pain.